Importance

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Abstract

In an optical recording medium of the type on which information can be written, erased, and read by irradiating light to a recording layer formed on a substrate and in which writing and erasing of the information are effected by phase transition between an amorphous phase and a crystalline phase, this invention relates to an optical recording medium which includes at least a recording layer and protective layers and the composition of the recording layer comprises at least one kind of metals selected from the group consisting of palladium (Pd), nickel (Ni), silver (Ag), and gold (Au); antimony (Sb); germanium (Ge); and tellurium (Te), and is expressed by the formula given below. The present invention provides an optical recording medium which has a high erasing speed, is excellent in recording characteristics such as a carrier-to-noise ratio, an erase ratio, recording sensitivity, etc., is capable of a large number of writing and erasing cycles, is excellent in thermal stability, oxidation resistance and moisture-and-heat resistance, and has a long service life. (M.sub.x Sb.sub.y Te.sub.1-x-y).sub.1-z (Te.sub.0.5 Ge.sub.0.5).sub.z 0.01.ltoreq.x.ltoreq.0.1 0.35.ltoreq.y.ltoreq.0.65 0.1.ltoreq.z.ltoreq.0.2 where each of x, y, z and 0.5 represents the atomic fraction of each element and M represents at least one kind of metals selected from the group consisting of Pd, Ni, Ag and Au.

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First Claim